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28 Sun Crypto Accelerator 4000 Board Installation and User’s Guide • May 2003
Gigabit Forced Mode Parameter
For Gigabit links, this parameter determines the link-master. Generally, switches
are enabled as a link master; in which case, this parameter can remain unchanged. If
this is not the case, then the link-master parameter can be used to enable the vca
device as a link master.
Interpacket Gap Parameters
The vca device supports a programmable mode called enable-ipg0.
Before transmitting a packet with enable-ipg0 enabled (default), the vca device
adds an additional time delay. This delay, set by the ipg0 parameter, is in addition
to the delay set by the ipg1 and ipg2 parameters. The additional ipg0 delay
reduces collisions.
If enable-ipg0 is disabled, the value of ipg0 is ignored and no additional delay is
set. Only the delays set by ipg1 and ipg2 will be used. Disable enable-ipg0 if
other systems keep sending a large number of continuous packets. Systems that
1 0 Pauses are transmitted but are not
received.
0 1 Pauses are sent and received.
01or0adv-pause-cap determines
whether the pause capability is on
or off.
pause-on-threshold Defines the number of 64 byte blocks in the receive (RX) FIFO which causes the
board to generate an XON-PAUSE frame.
pause-off-threshold Defines the number of 64 byte blocks in the RX FIFO which causes the board to
generate an XOFF-PAUSE frame.
TABLE 3-4 Gigabit Forced Mode Parameter
Parameter Description
link-master When set to 1 this parameter enables master operation, assuming
the link partner is a slave.
When set to 0 this parameter enables slave operation, assuming the
link partner is a master. (default)
TABLE 3-3 Read-Write Flow Control Keyword Descriptions
Keyword Description